A troubled priest is called to an isolated ranch to examine an emotionally disturbed 18-year-old girl. After deciding that an exorcism must be performed to save the girl's life, Jacob is forced to improvise, using the meager resources available to him. But as he and the girl's sister rekindle an old romance, Jacob's own inner demons resurface. By the time he realizes the real demon resides within Claire and not Isabelle, he must struggle to save his own soul from the evil spirit that has set a trap to destroy him.